559
google search
Google search results:
1: https://brainly.in/question/5268301
++++++++++++++++
2: https://www.toppr.com/ask/en-us/question/the-speed-of-a-boat-in-still-water-is-8/
++++++++++++++++
3: https://www.toppr.com/ask/question/a-streamer-goes-downstream-from-one-port-to-another-in-4-hoursit-covers-the-same/
++++++++++++++++
4: https://www.quora.com/Boat-travels-upstream-from-Q-to-P-and-downstream-from-P-to-Q-in-3hrs-if-the-distance-between-P-to-Q-is-4km-and-the-speed-of-the-stream-is-1kmph-then-what-is-the-speed-of-the-boat-in-still-water
++++++++++++++++
5: https://www.allinterview.com/showanswers/112760/boat-goes-downstream-from-p-q-2hrs-upstream-6hrs-if-speed-stream-still-water-fin.html
++++++++++++++++
6: https://www.indiabix.com/aptitude/boats-and-streams/042002
++++++++++++++++
7: https://gmatclub.com/forum/time-speed-and-distance-simplified-150163.html
++++++++++++++++
8: https://www.youtube.com/watch?v=fL03r3exGSU
++++++++++++++++
9: https://upscfever.com/upsc-fever/en/test/ssc-cgl/time-distance/chp1.html
++++++++++++++++
10: https://leverageedu.com/blog/boats-and-streams-formula/
++++++++++++++++
11: https://iim-cat-questions-answers.2iim.com/quant/arithmetic/speed-time-races/
++++++++++++++++